Daily briefing: ‘Glimmer of hope’ at UN Ocean Conference as 50 countries ratify the High Seas Treaty
Nature, Published online: 16 June 2025; doi:10.1038/d41586-025-01919-xFifty countries have now ratified the UN High Seas Treaty, an agreement to put 30% of the ocean into protected areas. Plus, researchers have grown hearts containing human cells in pig embryos for the first time and the mysterious link between Earth’s magnetism and oxygen.

Nature, Published online: 16 June 2025; doi:10.1038/d41586-025-01919-xFifty countries have now ratified the UN High Seas Treaty, an agreement to put 30% of the ocean into protected areas. Plus, researchers have grown hearts containing human cells in pig embryos for the first time and the mysterious link between Earth’s magnetism and oxygen.